Ventilated switch stud



June 13, 1933. E. J. THOMPSON ET AL. 1,913,522

VENTILATED SWITCH STUD Filed Sept. 18, 1930 Erna ma J 7700110193010 Jami/6s J a/rkese UNITED-STATES marsh vimiilxnsn, or cHIcAeo, iniimois. assrenons tricalfswitches and no provisionhas been Patented June 13,1933

DELTA gunm n: squ rm, or cmonso. ILLINOIS, A. conronn'rrom or un ors L l p l V RT T D J A pp licdtiph illegl se iteinber This invention relates to: ventilated switch studs for electric switehes which provide amechanically stronger strueture with alower 1 production cost and the operation of 5 the switch withifa lowerskin 'efl'ecti 'due' to the larger diameter and hollow construction. In makingelectricallswitches where heavy loads of electrical current must; I be earned therethrough, it; is desirous that thefstruc ture may be strong and sturdy aswell as economical to manufacturefi In "the past in a the manufacturefof electrical switches solid rodhas been used together 1 with "cast parts which have been machined up tothe desired shape forproviding switch studs for elecmade for the ventilation or wherein a better constructionbould-beprovided at a lower costfij I In our switch structure we accomplish the results desired" by 1 providing hard drawn eoppertubing instead of solid rodshaving a ventilating openingithrough the stud which supports the switc mammal-and thus-we provideba switch structlirewherein a much higher current may be carried at lower tena- .pera tureriSesQ i j A further advantage of our switch structureresides in the mounting. of the terminals on the tubular studsto rigidly support the same thereon, and threading thestuds so that -clamping :nuts and washers may be i used toTsupport jthe studs by the insulators and upon the supportin plate or {base {for the switch. The switch 'terminals have'com p e entary it l wpe ng which ister withjthe'openings olfithe studs so that a free ventilation of the'terminals and base thereof is accomplished in our switch struc-. ture. Economy of. our construction in the manufacture of electrical switches, together i with the higher efficiency inthe operation of the switch provides a means of advancement in the art which we believe is of pri-- mary importance.

side view of a switch assem- The details of the structurewith the parswi'rcn STUD 18;;1930. "seri liz 482,702. i i

bly," showing our ventilatingfswitch studs Figurej2 is asection of oneof theventilatingswitch studs and terminal. Y 'Figurefi isa side viewxof asw itchstud and terminalwith a ventilatingpassage. Figures: illustrates another sideflview of the ventilating stud and terminal. the ventilatingstudahd terminal. A

Figure 61s a planview of Figur'et'. Figure Tis aplanview ofFigure4. The switchstud is formed of tubing which may be made of hard drawn copper Figure 5 illustrates a' further side view of r or other suitable. material, having a central ventilating hole 11 throughwhich'air may pass to ventilate the stud 10 when it is in operation.

Thestud 10 may be threadedon the ends at 12 and 13 and is adapted to'support the terminal 1&1 which is provided with" abase portion which may {bescrewed on to the threaded portion 13, or may be sweat on to the same; or the basefl5f may be at? tached' to the studin, any otherhsuitable manner. The drawing illustrates thebase portion 15 .threadably secured to thestud :10, and held in this threaded engagement by pins 22 through the base 15 and extendiiig into thejstuoiogf The-studs *lOl ma be;mounted with insulators such as B-to support theswitch blades 16 on the supporting plate 17 when it is, desired. Any suitable mounting may be employed itosuppor't the switch blades "and the studs 10 maybe mountedin any desired manner to hold; the switch blades 16 so thatthey-willjoperatewith theterminals 14, The studs may bep1aced as far apart as desired and any mounting may may be desired and'evena multiplicity of terminals 14 maybe employed with the base structure 15,suoh1 as isillustrated in Figbe' formed with ventilating. .openings 18 in. the sides lofjthe same whichcommunicate withopenings 19. in the studs .10 ,wwhile the supporting "the switch in operative positiohi urest and-7'.-.. The base portion 13 may i openings 19 in turn communicate with the center longitudinal ventilating opening 11. Thus permitting the free ventilation of air through the base of the terminal for the switch A. An opening 20 is provided in the base 15 which communicates directly and is in line with the opening 11. so'that a direct passage of air may extend freely through the stud l0 and through the base In this manner we provide a switch structure having a free ventilation through the studs 10 and through the base and about the terminals 14. This structure also provides a tubular supporting stud such as 10 upon which the terminals of the switch A are mounted. This tubular form of. terminal is mechanically stronger and owing to its large overall diameter a lower skin effect is accomplished ill the switch structure for the electrical switch A than in switch construction used heretofore. The accomplishments of our switch have a primary importance in. providing a means ofproducing a switch with a low cost of manufacture and adapted to carry much higherelectrical currents with a lower temperature rise, thereby providing greater efliciency in a better and more economical manner. Heavy currents ma be easily carried by our switch studs and switch structure. It is a material advantage in electrical switches to provide a construction which will tend to keep down the temperature of the parts in operation.

-'In accordance with the patent statutes. the foregoing description represents the best embodiment of our invention, nevertheless we desire to have it clear that. such obvious changes as may. be apparent to those skilled in the art should be interpreted withint he scope of the followingclai ms, I

We claim:

l. A switch structure including, hollow,

2. An electrical switch having knife blades,.terminals for supporting said. blades having basesgfor mounting said terminals ventilating openings longitudinally and transversely through said studs and terminals.

4. A ventilated switch stud in combination with a switchblade terminal, including, a hollow stud member, aswitch terminal having switch, blade engaging, surfaces, and ventilating openings formed in said terminal communicating with the ventilating openingextending through said stud.

A switch stud and terminal for electrical knife blade switches including, a hollo-w'terminal stud, a terminal having a switch blade engagingend, a stud engaging end'on's'aid terminal, pin means for attaching said, terminal to said stud, and a ventilatingopening through said stud engaging end of said terminal, adapted to communieate with the hollow switch studto provide .ventilationfor said stud and terminal.

6.. The combination, switch terminals, studs for supporting said terminals, and longitudinal .and transverse openings throughsaid studs and terminals to provide ventilation foran electrical switch. y

7 A ventilated stud for transmittingelectrical currentfincluding, ahollow stud memher, and unobstructed transverse ventilating hples formed therein to permit free passage 0 a1r.

8. A ventilated stud for transmitting electrical current including, a tubular stud member, an insulating member enclosing said stud member, and transverse ventilating holes formed in the unclosed portion of said stud member to permit' the free passage of air therethrough. V ,7 1 I, V I

9 A ventilatedswitch stud and terminal including, a hollow tubular switch stud, threads on one endv thereof to accommodate 'a switch terminal, a terminal having switch blade engaging surfaces, a base on said ter minal adapted to be threadably secured to said stud,pinsffor securing said terminal in threadable engagement with said stud, an

opening in said base in alignment with the opening through said tubular stud, and a transverse openingthrough said stud and terminal base communicating with the opening through said tubular stud.

, ERMINE J. THOMPSON. JAMES MARKESE,

formed therewith, a hollow switch stud for said terminalsgsecured thereto, and an openor ing in said bases communicating with the V hollow opening through said stud.

.3. An electrical switch including, knife blades, fiatterminal mountings for engagement with said blades, a cap base for said said terminals, means for securing said base mountings, tubular supporting studs for 7 to said tubular supporting studs and air 

